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Dendritic Ag/Pd Alloy Nanostructure Arrays for Electrochemical CO 2 Reduction
Author(s) -
Han Jie,
Li Shasha,
Chen Jiaye,
Liu Yongqiang,
Geng Dongsheng,
Wang Dawei,
Zhang Lichun
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000405
Subject(s) - bimetallic strip , faraday efficiency , galvanic cell , selectivity , catalysis , electrochemistry , alloy , materials science , nanostructure , dendrite (mathematics) , chemical engineering , current density , nanotechnology , electrode , metallurgy , metal , chemistry , organic chemistry , quantum mechanics , geometry , mathematics , physics , engineering
Electrochemical reduction of CO 2 to value‐added chemicals is a promising strategy for the utilization of excess CO 2 . But, such reaction suffers from poor efficiency due to insufficient selectivity of electrocatalysts. Aimed at developing highly efficient electrocatalysts, dendritic Ag/Pd alloys with different compositions were synthesized through a simple galvanic replacement reaction. We found that the Ag/Pd alloy with an atomic ratio of 70 % Ag and 30 % Pd can selectively convert CO 2 to CO with a maximum faradaic efficiency of 98.6 % and a current density of 9.3 mA/cm 2 at −0.8 V, showing the best catalytic properties. Such improved performance can be ascribed to the factors that the introduction of Pd boosts the key intermediate formation and the dendrite morphology with a hydrophobic surface provides multiple active sites and increases CO 2 concentration. This study may benefit the design of bimetallic alloy catalysts with improved activity and selectivity for CO 2 reduction.